Attestor

·noun One who attests.

attestor
at-testor, ātus, 1, v. dep., to bear witness to , to attest , prove , confirm , corroborate (ve...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
attestor
attestor (adt-) —, ārī ad + testor, to prove, confirm : hoc, Ph. ...

An Elementary Latin Dictionary